The composite gas detector is a safe device that can continuously detect the concentration of combustible gas. It has good sensitivity and repeatability; the instrument is controlled by an embedded microcomputer, with simple operation, complete functions, high reliability, and a variety of adaptive capabilities; intuitive and clear; small and beautiful portable design not only makes you love it, but also facilitates your mobile use . The shell is made of high-strength engineering plastics, with high strength, good hand feel, and waterproof, dust-proof and explosion-proof.
Points to note when using the composite gas detector:
1. Pay attention to regular calibration and testing.
The toxic and harmful gas detector, like other analytical testing instruments, is measured by a relative method: first, use a zero gas and a standard concentration of gas to calibrate the instrument, and obtain a standard curve and store it in the instrument. During the measurement, the instrument compares the electrical signal generated by the gas concentration to be measured with the electrical signal of the standard concentration, and calculates the accurate gas concentration value. Therefore, it is necessary to calibrate the instrument at any time and to calibrate the instrument frequently to ensure the accurate measurement of the instrument. It should be noted that many gas detectors can replace the detection sensor at present, but this does not mean that a detector can be equipped with different detector probes at any time. Whenever a probe is replaced, in addition to a certain sensor activation time, the instrument must be recalibrated. In addition, it is recommended to perform response detection on the standard gas used in the instrument before various instruments are used to ensure that the instrument really plays a protective role.
Second, pay attention to the detection interference between various sensors.
Generally speaking, each kind of sensor corresponds to a specific detection gas, but it is impossible for any kind of gas detector to be effective. Therefore, when choosing a gas sensor, it is necessary to understand the detection interference of other gases on the sensor as much as possible to ensure its accurate detection of a specific gas.
3. Pay attention to the concentration measurement range of the detection instrument:
All kinds of toxic and harmful gas detectors have their fixed detection range. Only when the measurement is completed within its measurement range can the instrument perform the measurement accurately. If the measurement is carried out beyond the measurement range for a long time, it may cause permanent damage to the sensor.
For example, the LEL detector, if accidentally used in an environment exceeding 100% LEL, may completely burn the sensor. And toxic gas detectors will also cause damage if they are used for a long time at higher concentrations. Therefore, if the fixed instrument sends out an over-limit signal during use, the measurement circuit should be closed immediately to ensure the safety of the sensor.
Fourth, pay attention to the life of various sensors:
All kinds of gas sensors have a certain service life, that is, life. Generally speaking, in portable instruments, LEL sensors have a longer lifespan and can generally be used for about three years; photoionization detectors have a lifespan of four years or longer; electrochemical specific gas sensors have a relatively short lifespan, generally In one to two years; the oxygen sensor has a shorter lifespan, probably around a year. The life of the electrochemical sensor depends on the drying up of the electrolyte, so if it is not used for a long time, sealing it in a lower temperature environment can prolong the service life. Fixed instruments have a longer sensor life due to their relatively large size. Therefore, it is necessary to test the sensor at any time, use it within the validity period of the sensor as much as possible, and replace it in time once it fails.
